Question

1) Resolva as questões
a) 4 - $\frac{4}{5} . ( \frac{1}{2} + \frac{2}{5})$

Answer 1

$a) \\ 4- \frac{4}{5}.( \frac{1}{2} + \frac{2}{5} )= \\ \\ =4- \frac{4}{5}.( \frac{1.5+2.2}{10} )= \\ \\ =4- \frac{4}{5}.( \frac{5+4}{10} )= \\ \\= 4- \frac{4}{5}.( \frac{9}{10} )= \\ \\ = 4- \frac{36}{50}= \\ \\ = \frac{4.50-36.1}{50} = \\ \\ = \frac{200-36}{50} = \\ \\ = \frac{164}{50} = \frac{82}{25}$

Answer 2

a) 4-4/5.(1/2+2/5)=
=4-4/5.(5/10+4/10)
=4-4/5.(9/10)
=4-36/50
=200/50-36/50
=164/50
=82/25
ou
=3  7/25
ou
=3,28